honestly I just tell people to watch the cinematics for AC3 on youtube and then go play AC4:Black Flag lol
considering all the crazy science they've introduced my bet is they will use his DNA to make a clone.
In all honesty the series is in dire need of something because AC4 brought way too much gameplay leaving much to be desired in AC:U and killing off Connor kind of neutered the story a bit.
This is the way I feel about Unity as well. I liked the stories in most of the other AC games but this one just felt out of place I guess. Arno felt like just another guy, he did not feel like he really had a purpose.
I also feel like they went backwards in the combat area in Unity. I know they added different things like the new way free running is done that I thought helped a lot, but they took away old weapons that used to just be fun. I miss the dart rope and poison that actually did something rather than a little bit of damage and was generally a waste.
I am with you on this in that they did not need to fix was was not broken. The same type of gameplay I am fine with, as it is usually the story that draws me in, and Unity just did not have an interesting one.